The present invention relates to a precipitation hardened high Ni heat-resistant alloy having a component composition including, in terms of mass %: Cr: 14 to 25%; Mo: 15% or less; Co: 15% or less; Cu: 5% or less; Al: 4% or less; Ti: 4% or less; Nb: 6% or less; provided that Al+Ti+Nb is 1.0% or more; and inevitable impurities including at least C and N, with the balance being Ni, in which C is contained in an amount of 0.01% or less, and N fixed as carbonitride is contained in such an amount that Michelin point determined from inclusions extracted by an evaluation method according to ASTM-E45 is 100 or less.

The present invention relates to a method (1) of producing a metal superalloy (10) comprising the steps of providing a charge of metal materials (2); melting said charge of metal materials (2) in an electric-arc furnace (3) to obtain a first melt (3A) of said charge of metal materials (2); solidifying (5) said first melt (3A) to obtain first ingots (5A); melting said first ingots (5A) in a V.I.D.P. furnace (6) to obtain a second melt (6A); solidifying (7) said second melt (6A) to obtain second ingots (7A); melting said second ingots (7A) in a V.A.R. furnace (8) to obtain a third melt (8A); solidifying (9) said third melt (8A) to obtain a metal superalloy (10). The method (1) is characterized in that the charge of metal materials (2) has a weight amount ranging from forty to sixty tons, and it includes a step of carrying out an A.O.D. treatment (4) on said first melt (3A) to obtain a decarburized and refined first melt (4A); said melting in the V.I.D.P. furnace (6) and said melting in the V.A.R. furnace (8) are carried out sequentially on said first melt (4A) resulting from said A.O.D. treatment (4).

A method for recycling a Ni-based single crystal superalloy part or unidirectionally solidified superalloy part provided with a thermal barrier coating containing at least a ceramic on a surface of a Ni-based single crystal superalloy substrate or Ni-based unidirectionally solidified superalloy substrate, in which the method including the steps of: melting and desulfurizing a Ni-based single crystal superalloy part or Ni-based unidirectionally solidified superalloy part at a temperature of the melting point or more of the Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy and less than the melting point of the ceramic; heating a casting mold for a recycled Ni-based single crystal superalloy part or casting mold for a recycled Ni-based unidirectionally solidified superalloy part to a temperature of the melting point or more of the Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy; pouring the desulfurized melted Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy into the casting mold, and producing a melting stock or growing a Ni-based single crystal superalloy or Ni-based unidirectionally solidified superalloy; and removing the melting stock or the recycled Ni-based single crystal superalloy part or recycled Ni-based unidirectionally solidified superalloy part from the casting mold. In this way, a method for recycling a Ni-based superalloy part, by which the recycle cost of a Ni-based superalloy part and the lifetime cost of a highly efficient gas turbine engine using a Ni-based superalloy part can be significantly reduced, and further a Ni-based superalloy part having the same high-temperature strength and oxidation resistance as those of a newly produced Ni-based superalloy part can be obtained, is provided.

A method for producing a metal film from an over 50% nickel alloy melts more than one ton of the alloy in a furnace, followed by VOD or VLF system treatment, then pouring off to form a pre-product, followed by re-melting by VAR and/or ESU. The pre-product is annealed 1-300 hours between 800 and 1350 C. under air or protection gas, then hot-formed between 1300 and 600 C., such that the pre-product then has 1-100 mm thickness after the forming and is not recrystallized, recovered, and/or (dynamically) recrystallized having a grain size below 300 m. The pre-product is pickled, then cold-formed to produce a film having 10-600 m end thickness and a deformation ratio greater than 90%. The film is cut into 5-300 mm strips annealed 1 second to 5 hours under protection gas between 600 and 1200 C. in a continuous furnace, then recrystallized to have a high cubic texture proportion.

A NiAl-RE ternary eutectic alloy and a preparation method thereof are provided. The alloy is composed of the following elements by weight percent, aluminum (Al) of 2.50% to 19.50%, rare earth (RE) of 1.30% to 20.0%, other impurity elements being less than or equal to 0.10%, and the rest being nickel (Ni). The microstructure of the alloy is in a completely eutectic form, and the density is 6.8 to 7.1 g/cm.sup.3. Raw materials are prepared according to the ratio, and are placed into a vacuum induction smelting furnace; the smelting furnace is vacuumized to 10.sup.5 Pa, power is increased to ensure complete melting of the raw materials, and the molten alloy melt is poured into an iron mold to obtain alloy ingots. The eutectic phase in the microstructure of the alloy in the disclosure has high hardness.

The invention relates to a rare earth based hydrogen storage alloy, represented by the general formula (I):
RE.sub.xY.sub.yNi.sub.z-a-b-cMn.sub.aAl.sub.bM.sub.cZr.sub.ATi.sub.B(I)
wherein RE denotes one or more element(s) selected from La, Ce, Pr, Nd, Sm, Gd; M denotes one or more element(s) selected from Cu, Fe, Co, Sn, V, W. The alloy has favorable pressure-composition-temperature characteristic, high hydrogen storage capacity, high electrochemical capacity. The alloy doesn't contain magnesium element, and the preparation process of the alloy is easy and safe.

Alloys, processes for preparing the alloys, and articles including the alloys are provided. The alloys can include, by weight, about 4% to about 7% aluminum, 0% to about 0.2% carbon, about 7% to about 11% cobalt, about 5% to about 9% chromium, about 0.01% to about 0.2% hafnium, about 0.5% to about 2% molybdenum, 0% to about 1.5% rhenium, about 8% to about 10.5% tantalum, about 0.01% to about 0.5% titanium, and about 6% to about 10% tungsten, the balance essentially nickel and incidental elements and impurities.

Provided is a nickel material having excellent corrosion resistance and high strength, and a method for manufacturing the nickel material. A nickel material has a chemical composition consisting of, in mass %, C: 0.001 to 0.20%, Si: 0.15% or less, Mn: 0.50% or less, P: 0.030% or less, S: 0.010% or less, Cu: 0.10% or less, Mg: 0.15% or less, Ti: 0.005 to 1.0%, Nb: 0.040 to 1.0%, Fe: 0.40% or less, sol. Al: 0.01 to 0.10%, an N: 0.0010 to 0.080%, with the balance being Ni and impurities, and satisfying Formula (1) and Formula (2).

0.030( 45/48)Ti+( 5/93)Nb( 1/14)N<0.25(1)

0.030<( 3/48)Ti+( 88/93)Nb( 1/12)C(2)

A content (mass %) of a corresponding element is substituted for each element symbol in Formula (1) and Formula (2).

A high creep-resistant equiaxed grain nickel-based superalloy. The high creep-resistant equiaxed grain nickel-based superalloy is characterized that the chemical compositions in weight ratios include Cr in 8.0 to 9.5 wt %, W in 9.5 to 10.5 wt %, Co in 9.5 to 10.5 wt %, Al in 5.0 to 6.0 wt %, Ti in 0.5 to 1.5 wt %, Mo in 0.5 to 1.0 wt %, Ta in 2.5 to 4.0 wt %, Hf in 1.0 to 2.0 wt %, Ir in 2.0 to 4.0 wt %, C in 0.1 to 0.2 wt %, B in 0.01 to 0.1 wt %, Zr in 0.01 to 0.10 wt %, and the remaining part formed by Ni and inevitable impurities.

There is provided a Ni-based intermetallic alloy having a dual multi-phase microstructure containing a primary precipitate L1.sub.2 phase and an (L1.sub.2+D0.sub.22) eutectoid microstructure. Thus, the Ni-based intermetallic alloy contains Ni, Al, and V as basic elements, and the contents of Ni, Al, and V are controlled to form the dual multi-phase microstructure. The Ni-based intermetallic alloy further contains at least one of Zr and Hf in addition to the basic elements.